How to Convert excel to HTML using php

Using php to convert excel to HTML to convert various documents (such as pdf and excel) into HTML can be understood as the online document preview requirement. At present, there is no problem in converting pdf to html, but Microsoft documents such as excel have not been ready yet. I want to find some open-source software that can be used. (It's hard to parse all of them.) I'm a beginner in php. I use php to convert excel to HTML.
To convert a variety of documents (pdf, excel, etc.) into HTML, you can understand the online document preview requirement.
At present, there is no problem in converting pdf to html, but Microsoft documents such as excel have not been ready yet. I want to find some open-source software that can be used. (All parsing is a little difficult)

I am very grateful to you for your understanding of php.

------ Solution --------------------
PHP can read the csv format in excel. after obtaining the data, you can perform html layout as required:

PHP code

$ Row = 1; $ handle = fopen ("test.csv", "r"); while ($ data = fgetcsv ($ handle, 1000 ,",")) {$ num = count ($ data); echo"
$ Num fields in line $ row:
\ N "; $ row ++; for ($ c = 0; $ c <$ num; $ c ++) {echo $ data [$ c]."
\ N ";}} fclose ($ handle );
------ Solution --------------------
Http://www.iteye.com/topic/333676
------ Solution --------------------
How do you do this? please share it with me.
------ Solution --------------------
PHPExcel to parse the data. You need to perform operations on your own to convert to html.
URL: http://phpexcel.codeplex.com/